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Joined: Oct 2000
Posts: 5,392
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we could take this to the 'nith degree by asking if the writing side be visible.
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Joined: Oct 2000
Posts: 4,116 Likes: 4
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Foca Se,
I have tried recently to always put the flat cable on top to avoid compromising the integrity of the insulation on the 3 wire cables. I've noticed problems with the 3 wire in smaller sizes (#14) being held in Romex clamps too tightly and creating shorts.
Bill
Bill
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Joined: Oct 2000
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wood shrinks, moves,etc. insulators may not 'break' around rx. I always staples very loose for these reasons.
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Joined: Nov 2000
Posts: 246
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I thought I would bring this thread back to life.
I was told lately that double cable stapleing violated the bundleing rules.
Article 310.15.B.2.b says to derate conductors according to the number of current carrying conductors.
Say I have 3 cables, each a 3-wire #12. That gives me 9 current carrying conductors, which means I have to derate by 70%
Table 310-16 gives a #12 amp rating at 30 amps. 70% of 30 = 21amps. The maximum o.c. device on this size of wire is 20amp. Is the wire protected? Yes, so what is the problem?
I could do the same for 9 #14 wire (25amps X 70% = 17.5)
As long as I don't go over 9 current carrying conductors in a bundle, there is no problem, is there?
Anyone have problems with the bundleing rules as applied to nm cable?
I would like to forward this thread to the inspector who made this call, after I hear from you all on this.
Thanks in advance.
Rick Miell
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Joined: Oct 2000
Posts: 5,392
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excellent comeback Rick
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Joined: Jan 2002
Posts: 1,457
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I am wondering why you would staple on edge rather than on the flat? Seems like a bad idea to me. I use the stackers as well as the wire ties with mounting holes for more than two wires.
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Joined: Nov 2000
Posts: 2,148
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Rick, In many cases the grounded conductor is not a current carrying conductor for the purpose of derating, so you can go to 4 3-wire cables and still have only 8 current carrying conductors. Don
Don(resqcapt19)
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Joined: Feb 2002
Posts: 2,233
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Hey guys, what to here a good one. I hear that RX staples are not UL listed for the application. Did anyone else hear of this?
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Joined: Jun 2001
Posts: 642
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Does UL list common hardware like nuts bolts screws or staples for use? I remember bieng told that they do not.
ed
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Joined: Feb 2002
Posts: 2,233
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This is where the AHJ and sec. 90-4 (1999 NEC) code comes into effect. The AHJ can and may allow certain things to pass inspection even if they don't meet UL approval.
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Posts: 46
Joined: March 2013
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